Backup Exec 2012 Store does not recognise RDX drive

I have installed BE 2012 and connected a Tandberg RDX drive that is displayed correctly as drive E:

If I under “configure store” select the hard disk drive (RDX) which is correctly displayed as E: finish the setup with OK. The RDX drive is not displayed in the windows “configure store”. Also if I try to set up a new backup job I get the message that no store is configured. When I try to set up the RDX drive again with the same name I get the message that a store under these name already exists.

Any clue? Can´t set up any backup job. RDX drive works I can copy an delete files on drive E:

Are you choosing to configure it as Disk Storage or Disk Cartridge ? (Disk storage when it appears as a fixed disk in Device Manager & the latter if it appears as removable)...Ideally, it should be the latter.